docs: def get_staking_cutoff(self, round_num=0, tournament=1):
          """Compute staking cutoff for the given round and tournament.
  
          Args:
              round_num (int, optional): The round you are interested in,
                  defaults to current round.
              tournament (int, optional): ID of the tournament, defaults to 1
  
          Returns:
              decimal.Decimal: cutoff probability
  
          Raises:
              ValueError: in case of missing prize pool information
          """
          query = '''
              query($number: Int!
                    $tournament: Int!) {
                rounds(number: $number
                       tournament: $tournament) {
                  selection {
                    outcome
                    pCutoff
                    bCutoff
                  }
                }
              }
          '''
          arguments = {'number': round_num, 'tournament': tournament}
          result = self.raw_query(query, arguments)
          result = result['data']['rounds'][0]['selection']
          key = 'bCutoff' if round_num >= 154 or round_num == 0 else 'pCutoff'
          return utils.parse_float_string(result[key])